I set the bias to "better" but it seems like the efficiency modules get worse with higher tiers? The tier 1 has a +7% additive effect, but since it reduces a machine's consumption it's actually worse than vanilla! tier 2 has +11.1% (going from -40% consumption to just -28%) and tier 3 has +17.9% (-50% -> -32%). If it was just one of the tiers being worse i wouldn't be surprised but all 3 being worse with increasing effects leads me to believe the bias has an inverted effect.
